Mechanical hammer



Alu-i124, 1928. 1,667,546

R. GOLDSCHMIDT MECHANICAL HAMMER Filed July 9, 1925 Patented Apr. 24, 1928s- UNITED STATES PATENT OFFICE.

IECHANICAL HAMMER.

Application led 111173, 1925'. Serial No. 42,353.

My invention relates to mechanical hammers wherein rotating eccentric weights are adapted to cause the tup to reciprocate through ,the action of centrifugal force. In such hammers, the weights and gearing to rotate the same must be all a part of the reci rocating tup where they are subject to the ull foi-ce of the impact of the blows that are delivered by the tup.

Y therewith. The weighted gears 22 an In a hammer of the type described in rny Patent No. 1,410,010, the tu is reciprocated through the action of two yweights. In a construction employing four flyweights on the tup, considerable ditliculty is encountered in designing the tup and the mountings for the iywei ts in a sufficiently rigid structure to wit stand the impacts.

It is the object of the present in vention to produce a hammer having a tn p with four flywei hts mounted thereon having a structure t at will withstand the shock of the im act.

v he present invention may be best understood with reference to the accompanying drawingwherein Figure 1 is a view, p artly in section, with parts broken awa illustratin one form of motor-driven ammer embo ying my invention, and

Figs; 2, 3 and 4 are modified forms of tup mechanism for use in the casing illustrated in Fi 1.

Rearring to Fig. 1, 11 is an enclosing casing that has a to plate 12 secured thereto by'means of bo ts 13. Mounted on the casing is a motor 14 to which is attached a handle 15 with a switch operatin trigger 16 therein, all of which is a we l-known construction.

A shaft 17 is rotated by the motor and has formed integral therewith a pinion 18. A second pinion 19 is keyed to the shaft, and

the lower end is' seated in a bearing in thev frame 21 of the tup.

The pinions 18 and 19 are meshed with a pair of bevelled gears 22 and 23 respectively, each gear having a weight cast inte r2azl are respectively mounted upon transverse shafts 24-and 25, which in turn are mounted in the frame 2 1 of the tup.

It'will be vnoted that shafts 24 .and 25 extend across the frame and each have a hole 26 therein., to permit the shaft 17 to extend 'therethroug1` x.ai;`

A cross-member 27 is secured to the top of the frame.21.. The tup 21 carries the guiding lugs 28 that cooperate with stationary guides 29 secured tothe casing 11.

A spring 31 is mounted between the'top of the casing 12 and the top ol the frame or tup 21, so as to impart a unidirectional force to the tup. v

The driving shaft 17 and shaft of the motor 14 are connected by a flexible coupling indicated at 32.

Since it is desirable to have the tup and gearing operate in a bath of il, the casing 11 is closed at the bottom by means of a iiexible diaphragm 33 in which is secured an anvil 34.

When a tool 35 is inserted linto the hammer, the blows from the tup are transmitted directl to the tool. However, when there is no too inserted, the blows are received by av cushion 36 that may be composed of a series of leather discs.

In the operation of the hammer, the centrifugal force imparted by the rotating weights causes the frame or tup 21v to reciprocate and the vspring imparts a unidirectional force that causes the tup to deliver blows to thevanvil 34.

Several different arrangements .of tups may be had, one form being shown in Fig. 2 wherein the -pinions 18 and 19 are located near the center of the shaft 17. It may also be noted -that the frame 21 is formed in two sections that are bolted together at the top and bottom .as indicated at 37. The

bevelled gears 22 and 23 arc`each mounted upon a stub shaft 38 that nia be formed integral with the frame 21, tins forming a rigidl construction for the tup.

It will be noted that the stub shafts 38 are made hollow to form .pockets where oil may collect and these pockets are connected through holes 39 with the bearin'r surfaces of the journals for the gears 22 and'` 23. The movement of the tup forces the oil'into these holes with considerable pressure, particularly when the motion of the tup is suddenly arrested at the moment of impact and'at the moment of reversal ofthe movement from the-upper position so that the acceleration and retardation of the tup is used for. obtaining forced lubrication of the mechanism, which is very desirable.

Fig. 3 isa sectional view of another modified form of tu and Fig. 4 is a view of the tup shown in ig. 3 taken at right angles to the plane of the tup as shown 1n Fig. 3.

In Fics. 3 and 4 the shafts 41 and 42, upon which the bevelled gears 22 and 23 rotate, are integral with the tup 21 irojecting from the center thereo'f upwar ly. This construction has the advantage that a solid construct-ion is obtained without the necessity of splitting the tup. The pinions 43 and 44 are formed integral with each other, and are keyed to the shaft 17 as indicatedl hy dotted lines in Fig. 3.

In my Patent No. 1,410,010, referred to above, is described a method of splmlng the pinion to the shaft so that this construction can bc used as a guide for the whole tup, rendering;` the. guide members 28 and 29 unnecessary.

Modifications may be made in the arrangement and location of parts withinthe spirit of my invention and the scope of the appended claim.

I claim:

In a mechanical hammer the combination with an enclosing casing and a motor of a tup within said casing comprising a rame a pair of shafts extending transversely ci said frame, four weights mounted on said shafts so as to cause the reciprocation of said tup due to lthe centrifugal action of said weights, gears adapted to rotate said weights,p1nions meshing with said gears, a vertical shaft on which said pinions are mounted, vsaid vertical shaft extending through said transverse shafts and connected to said motor.

In testimony whereof I afiix my signa- 

